Update... Shot the AC 50/50s today. 6" S&W 586 with nice throats. Sized to .358, lubed with 45/45/10 LLA/JPW. Shot 20 rounds up to 14.0 gr of 2400. No, zero, leading! 14.0 was too much as the extraction started to get a little sticky but it was the most accurate. Will back off to 13.8 and try again but now I feel confident that softer alloys will work just fine in this pistol.

Going to wait a couple of weeks per BABore's suggestion to try the OHTs in the Marlin.